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3rd AIAA Flow control Conference

作者： Morzyński, Marek Stankiewicz, Witold Noack, Bernd R. Thiele, Frank King, Rudibert Tadmor, Gilead Institute of Combustion Engines and Transportation Poznan University of Technology Piotrowo 3 60-965 Poznan Poland Institute of Fluid Dynamics and Technical Acoustics Berlin University of Technology Straße des 17. Juni D-10623 Berlin Germany Measurement and Control Group Berlin University of Technology Hardenbergstraße 36a D-10623 Berlin Germany Communication and Digital Signal Processing Center Northeastern University 440 Dana Research Building Boston MA 02115 United States

ISBN: (纸本)1563478137

In the current study, a generalization of POD Galerkin models is proposed targeting strategies for experimental feedback flow control. For practical reasons, that model should incorporate a range of flow operating conditions with small number of degrees of freedom. Standard POD Galerkin models are challenged by the over-optimization at one operating condition (Deane et al. 1991). Recent successful developments to extend the dynamic range require additional modes. This leads to a control design which is less online-capable and less robust. These side constraints for control-oriented ROMs are taken into account by a 'least-dimensional' Galerkin approximation based on a novel technique for continuous mode interpolation (Morzyński et al. 2006). This interpolation allows to preserve the model dimension of a single state while covering several states by adjusting (interpolated) modes. The resulting 3-dimensional Galerkin model is presented for the transient flow around the circular cylinder and shown to be in good agreement with the corresponding direct numerical simulation. The 3-dimensional model is based on the shift mode and interpolates between the two most energetic POD modes of natural limit cycle and the complex stability eigenmode representing the fixed-point dynamics. The interpolation technique is also used to approximate the POD modes with suitable stability eigenmodes. These efforts shall lead to a priori models from first principles without the need for empirical flow data. Copyright © 2006 by the American institute of Aeronautics and Astronautics, Inc.

关键词： Flow control

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Design of an Image Motion Compensation (IMC) algorithm for the communication, Ocean, Meteorological Satellite (COMS)

Design of an Image Motion Compensation (IMC) algorithm for t...

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AIAA/AAS Astrodynamics Specialist Conference, 2006

作者： Jung, Taek-Seo Lee, Un-Seob Park, Sang-Young Choi, Yoon-Hyuk Bang, Hyo-Choong Ju, Gwanghyeok Yang, Koon-Ho Yonsei University Seoul 120-749 Korea Republic of Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea Republic of Korea Aerospace Research Institute Daejeon 305-333 Korea Republic of Astrodynamics and Control Lab. Dept. of Astronomy and Space Science Flight Dynamics and Control Lab. Dept. of Aerospace Engineering Communication Satellite System Department

ISBN: (纸本)1563478226

This paper presents an Image Motion Compensation (IMC) algorithm for Korea's communication, Ocean, and Meteorological Satellite (COMS). An IMC algorithm is a priority component of the Image Navigation and Registration (INR) system to locate and register radiometric image data. To eliminate image distortions, depointing of the imager aiming direction must be adjusted. A compensation algorithm to correct depointing caused by satellite motion is designed, and the capability of the algorithm is compared with that of existing algorithm applied to the GOES's INR system. The algorithm developed in this paper improves pointing accuracy by efficiently compensating for depointing of the imager aiming direction. Copyright © 2006 by the American institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Motion compensation

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Online frequency estimation using power series type wavelet transform

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IEEJ Transactions on Industry Applications 2006年第5期126卷 646-652+15页

作者： Tsuji, Mineo Hamasaki, Shin-Ichi Uemura, Hitoshi Yamada, Eiji Department of Electrical and Electronic Engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan Mitsubishi Electric Corporation Japan Nagasaki University Japan Society of Instrumentation and Control Engineers of Japan Japan Japan Society of Applied Electromagnetics Japan IEEE Japan Department of Electrical and Electronic Engineering Nagasaki University Japan Wuhan University of Technology China European Power Electronics and Drives Association Japan Institute of Electronics Information and Communication Engineers of Japan Japan

In this paper, a new approach to estimate the power system frequency using wavelet transform is proposed. The wavelet function is expressed by the power series and is able to be performed by the z-transform, which can shorten the estimating time of the signal frequency compared with the Gabor function. Simulation results, in which the fundamental frequency (60 Hz) or the harmonics frequency (300 Hz) of the signals are quickly estimated by the proposed method, are presented and the online estimation of the frequencies is successfully achieved by the proposed method in the experimental system using DSP.

关键词： Wavelet transforms

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Design of ladder based switched current circuits - A novel approach

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WSEAS Transactions on Circuits and Systems 2006年第12期5卷 1752-1759页

作者： Gupta, Maneesha Varshney, Pragya Visweswaran, G.S. Department of Electronics and Communication Engineering Netaji Subhas Institute of Technology University of Delhi Dwarka New Delhi - 110075 India Department of Instrumentation and Control Engineering Netaji Subhas Institute of Technology University of New Delhi Dwarka New Delhi - 110075 India Electrical Engineering Department Indian Institute of Technology New Delhi India

A novel approach for the design of Switched Current (SI) ladder circuits is discussed. Starting from the specifications of the filter in z-domain, continued fraction expansions (CFE) of the transfer function are obtained. Then Signal Flow Graphs (SFG) of each row of the expansion so derived are directly transformed into Switched Current structures (integrators and amplifiers). These SI blocks are connected in ladder form to generate the required SI circuit. Two examples have been used to demonstrate the utility of the approach. The circuits have been designed and simulated using OrCAD PSPICE.

关键词： Switching circuits

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Investigation of a Phenylalanine-Biosensor System for Phenylketonuria Detection

Investigation of a Phenylalanine-Biosensor System for Phenyl...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Zhuo Wang Ya-zhu Chen Su Zhang Zhen Zhou Biomedical Instrument Institute Shanghai Jiaotong University Shanghai China College of Measure-control Technology & Communication Engineering Harbin University of Science and Technology Harbin Heilongjiang China

Detection and prevention of Phenylketonuria (PKU) is becoming more and more important. However, the current methods are either imprecise or time-consuming. We propose a biosensor system based on phenylalanine ammonia-lyase (PAL) immobilized on an ammonia electrode to measure blood phenylalanine for PKU prevention. The biosensor exhibits good linearity from 10-5000 muM and the response time is only about 2 minutes. It remains stable for at least 5 days and less than 20% drop of the original activity after ten day storage at 4 D, while the service life of the biosensor could be up to 30 days. We also develop an intelligent system to ensure optimal conditions for operation and preservation of the biosensor and to make detection more convenient and reliable. All of these advantages indicate that the newly developed method could be a better one for solving the problems of PKU detection

关键词： Amino acids Biosensors Biomedical measurements Electrodes Microorganisms Blood Intelligent systems Testing Fluorescence Biomembranes

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Novel high-speed photopolarimeter based on a metallic grating

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Journal of Physics: Conference Series 2006年第1期48卷 1003-1007页

作者： Du, X.L. Dai, J.M. Sun, X.G. Department of Automatic Measurement and Control Harbin Institute of Technology Harbin 150001 China College of Electronic Engineering Heilongjiang University Harbin 150080 China

A novel high-speed photopolarimeter is presented in this paper, which is composed by the optical system, electronics system and PC. This instrument uses a metallic grating that can produce both reflective diffraction and transmission diffraction as a beam splitter to divide the incident light into many components, and the light fluxes of the four 1st order diffracted beams are converted linearly into four electrical signals by four photodiodes. After going through a signal conditioning circuit, these electrical signals are converted into digital values by high-speed A/D converters that can implement synchronous multi-channels sampling, and then the data sampled are high-speedily transmitted into the PC via a USB2.0 interface. The electrical signal vector I composed by the four electrical signals possesses the linear relationship with the incident light Stokes vector S. The nonsingular instrument matrix A of this instrument can be obtained by the calibration, and then the unknown Stokes vector S of the incidence light can be obtained from the equation S A^-1I. The testing results show that the mean deviations of the measured Stokes parameters compared with the predicted values are less than 1% at 632.8nm. It is compact and easy to be installed, and can be used as a polarization state detector in real-time polarimetry and ellipsometry. © 2006 IOP Publishing Ltd.

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A Fast Inter Mode Selection Algorithm for H.264

A Fast Inter Mode Selection Algorithm for H.264

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International Conference on Pervasive Computing and Applications (ICPCA)

作者： Yun Cheng Silian Xie Jianjun Guo Zhiying Wang Minlian Xiao College of Computer National University of Defense Technology Changsha China Department of Communication and Control Engineering Science and Technology Hunan Institute of Humanities Loudi China Department of Computing Hunan Institute of Humanities Science and Technology Loudi China

The high encoding efficiency of H.264 comes from many new video encoding technologies such as adopting variable block size in the process of motion estimation and compensation. But this increases the complexity of H.264 encoder greatly. The high encoding complexity limits the application of H.264 in the domain of real time video encoding. In order to decrease the complexity of H.264 encoder greatly, this paper proposes a fast inter mode selection algorithm to speed up the H.264 encoder. Experimental results show that the proposed algorithm can reduce the complexity of the inter mode decision remarkably while incurring little, if any, loss in quality

关键词： Encoding Motion estimation MPEG 4 Standard Video compression Pervasive computing Decoding Testing High definition video HDTV Video coding

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Low cost vibration measuring device using MEMS accelerometer

Low cost vibration measuring device using MEMS accelerometer

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2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings

作者： Jagadeesh, P. Umapathy, M. Balachandar, S. Arumugam, M. Ramaswamy, S. Larsen and Toubro Limited e-Engineering Solutions NH No.8 Chhani Baroda-391740 Gujarat India Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirappalli-620015 Tamilnadu India Department of Electronics and Communication Engg. Arunai Engineering College Tiruvannamalai-606603 Tamilnadu India R and D Arunai Engineering College Tiruvannamalai-606603 Tamilnadu India Department of Electrical and Electronics Engineering N P A Centenary Polytechnic Kotagiri-643217 Tamilnadu India

This paper presents the overall design of an industrial vibration transmitter using MEMS capacitive accelerometer. It describes the accelerometer sensor interfacing circuit, rms-to-dc converter, voltage to current loop converter circuit design, calibration procedure, and mounting methods. The industrial vibration transmitter output can be customized to obtain either acceleration or velocity with root mean square (rms) or peak (pk) value signal. The output of the transmitter is a current signal (4-20mA) which is proportional to input acceleration (0-10g rms). The AC coupling circuit for accelerometer sensor interfacing, RMS detector and industrial current loop converter circuit are implemented in a single printed circuit board. The prototype consists of 2 pin top connector for power input (24VDC), current output signal and stainless steel mechanical housing assembly with bottom thread connection for mounting. The loop powered acceleration vibration transmitter is employed for vibration monitoring and control applications.

关键词： Vibration measurement

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An enhanced zone-based routing protocol for mobile ad-hoc networks based on route reliability

An enhanced zone-based routing protocol for mobile ad-hoc ne...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： A. Koyama Y. Honma J. Arai L. Barolli Department of Informatics Yamagata University Japan Graduate School of Science and Engineering Yamagata University Japan Department of Information and Control Engineering Yamagata College of Industry and Technology Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Japan

In mobile ad-hoc networks (MANET), the nodes intercommunicate through single-hop and multi-hop paths in a peer-to-peer fashion. Intermediate nodes between two pairs of communication nodes act as routers. Thus the nodes operate both as hosts and routers. The nodes are mobile, so the topology of the network may change rapidly and unexpectedly. One of well-known routing protocol for ad-hoc networks is zone routing protocol (ZRP). However when the protocol searches for a new route, it sends many useless control packets, which increase the network load and decrease the network performance. In this paper, we propose an enhanced zone routing protocol (EZRP). In EZRP, each node calculates the reliability of the route. In the case of reliable route, the source node sends the data packet directly to the destination node using that route without route searching. While, in the case of unreliable route, the source node searches for a new route again. We show that the network performance can be improved by using EZRP.

关键词： Routing protocols Ad hoc networks Peer to peer computing Mobile ad hoc networks Mobile communication Network topology Wireless LAN Tin Informatics Reliability engineering

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High precision location algorithm for optical feature of vision measurement

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Journal of Physics: Conference Series 2006年第1期48卷 474-478页

作者： Liu, C.Y. Che, R.S. Gao, Y.H. College of Instrumentation and Electrical Engineering Jilin University Changchun 130001 China Department of Automation Measurement and Control Harbin Institute of Technology Harbin 150001 China

To meet the requirement for precision location of optical feature in the vision coordinates measurement system based on optical features imaging, the Gauss distribution multi-fitting location algorithm based on bilinear interpolation was presented in the paper. The method fit the grey distribution of optical feature imaging by Gauss distribution function, and the mathematics model was constructed on grey value of pixel points in the object image, coordinates location and centre of optical feature using the grey value height relativity among the pixels points in the feature image and the location of feature was estimated precisely. In the same, the bilinear interpolation algorithm and multi-fitting method were used to improve the location precision of the location algorithm presented. Finally, the experiment results show that the standard deviation is 0.0055 pixels and the repeatability is less than 0.011 pixels and prove the method holds good location precision and can locate for optical feature precisely. © 2006 IOP Publishing Ltd.

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